Submission #521274

#	Time	Username	Problem	Language	Result	Execution time	Memory
521274		AdamGS	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	273 ms	160044 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define rep(a, b) for(int a = 0; a < (b); ++a)
#define st first
#define nd second
#define pb push_back
#define all(a) a.begin(), a.end()
const int LIM=3e3+7;
string T[LIM];
ll lewo[LIM][LIM], dol[LIM][LIM];
int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	int n, m;
	cin >> n >> m;
	rep(i, n) {
		cin >> T[i];
		for(int j=m-1; j>=0; --j) lewo[i][j]=lewo[i][j+1]+(T[i][j]=='O');
	}
	rep(j, m) {
		for(int i=n-1; i>=0; --i) dol[i][j]=dol[i+1][j]+(T[i][j]=='I');
	}
	ll ans=0;
	rep(i, n) rep(j, m) if(T[i][j]=='J') ans+=lewo[i][j]*dol[i][j];
	cout << ans << '\n';
}

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50